Re: [RFC PATCH v15 2/7] locking/mutex: Rework task_struct::blocked_on

John Stultz
2025-03-14T06:13:11Z

On Thu, Mar 13, 2025 at 3:14 AM Steven Rostedt <rostedt@goodmis.org> wrote:
> FYI, this is useful for Masami's "hung task" work that will show what
> tasks a hung task is blocked on in a crash report.
>
> https://lore.kernel.org/all/174046694331.2194069.15472952050240807469.stgit@mhiramat.tok.corp.google.com/
>

Ah. Indeed, we have similar use cases. There's some slight difference
in when we consider the task blocked, especially in this early patch
(as waking tasks mark us as unblocked so we can be selected to run).
But later on in the series (in the portions I've not yet submitted
here) when the blocked_on_state has been introduced, the blocked_on
value approximates to about the same spot as used here.

So I should be able to unify these. It looks like Masami's patch is
close to being queued, so maybe I'll incorporate it into my series and
rework my set ontop. Any objections to this?

thanks
-john